216116649 has 12 divisors (see below), whose sum is σ = 356764096. Its totient is φ = 123495192.

The previous prime is 216116639. The next prime is 216116651. The reversal of 216116649 is 946611612.

216116649 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 1 + 6 + 649 = 666.

It is not a de Polignac number, because 216116649 - 2⁴ = 216116633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216116609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1715149 + ... + 1715274.

Almost surely, 2^216116649 is an apocalyptic number.

It is an amenable number.

216116649 is a deficient number, since it is larger than the sum of its proper divisors (140647447).

216116649 is a wasteful number, since it uses less digits than its factorization.

216116649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3430436 (or 3430433 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 216116649 is about 14700.9064006271. The cubic root of 216116649 is about 600.1079888962.

The spelling of 216116649 in words is "two hundred sixteen million, one hundred sixteen thousand, six hundred forty-nine".